Sun Valley Park Weather Forecast

    • 58
    • 72

    Decreasing Clouds

    • 46
    • 72

    Partly Sunny

    • 58
    • 70

    Mostly Cloudy

    • 19
    • 69

    Rain Likely

    • 17
    • 29

    Mostly Sunny

    • 23
    • 37

    Mostly Sunny

Today 25 Dec Jefferson

Mostly cloudy. Patchy dense fog. Highs in the lower 70s. West Winds around 5 Mph, becoming southeast around 5 Mph this afternoon.

Tonight 25 Dec Jefferson

Mostly cloudy. Lows in the upper 50s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Sun Valley Park Temperature Statistics

December Temperature

St. Louis Downtown Airport (22.4 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    33.7 °F

  • Highest 23 December, 2025

    69.1 °F

Climate (2020–Present)

St. Louis Downtown Airport (22.4 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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